Your outfit looks fine.

Just so that people will have something to discuss, I will suggest that you wear some other color socks. The navy blue is perfectly acceptable, but ( like black) always looks to me like you took off your dress trousers. It is a party. Why not inject a little color or even a second pattern? Again, because nobody can criticize your ensemble, I will suggest that you grab some argyle over the calf socks and wear them- this gives someone a chance to point out that OTC socks are NOT kilt hose.

You might try hiking your sporran up an inch or so, if it isn't already crowding your waistcoat. And be sure your watch chain is the same color as your cantle and sporran chain. Another thread will give you the dubious advantages of tucking your waistcoat into your kilt- and plenty of authority for NOT doing so.

Have a good time.